function s1_hello(){
  echo "hello,world!"
}
function s2_tell_who_i_am(){
echo "Enter you name:"
read user_name
echo "user name is $user_name"
}
function s3_which_distro_do_i_use(){
  NAME="Beta Linux"
  echo $NAME
}
function s4_view_my_cpu_arch(){
 uname -m
}
function s5_show_first_scsi_disk_size(){
 lsblk -l | \grep disk | \grep '^sda ' | awk '{print $4}'
}
function s6_show_main_memory_size_in_megabytes(){
  free -m |grep "Mem:" | awk '{print $2}'
}

